Door-lock.



W. H. HOFFMANN.

DOOR. LOCK.

APPLICATION FILED JULY 3, 1912.

Patented Feb. 17, 1914.

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COLUMBIA PLANOGRAPH 60.. WASHINGTON. D. c.

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WILLIAM H. HOFFMANN, OF NEW YORK, N. Y.

DOOR-LOCK.

To all whom it may concern:

Be it known that I, WILLIAM H. Horr- MANN, a citizen of the UnitedStates, and a resident of New York city, borough of Manhattan, in thecounty of New York and State of New York, have invented certain new anduseful Improvements in Door- Locks, of which the following is aspecification.

This invention relates to certain new and useful improvements in doorlocks and the object of my invention is to provide a new and improvedlock which can be readily locked or unlocked from the outside or insideto secure the door by one or more bolts and can be so adjusted that thedoor can be open at any time during the day by turning the knob, whileby the same means the door can be locked securely at night andfurthermore the lock can be so adjusted as not to be operative at all asa lock during the day, all of which is simple in construction, strong,durable and reliable.

In the accompanying drawings in which like letters of reference indicatelike parts in all the figures: Figure 1 is an elevation of part of adoor provided with my improved lock. Fig. 2 is an elevation of the lockmechanism, the outer cover plate being removed. Fig. 3 is an innerfaceview ofsaid coverplate. Fig. 4 is a view similar to Fig. 2 showingthe parts in another position. Fig. 5 is a vertical transverse sectionalview on the line 5 5 of Fig. 4.

The lock casing 1 is to be mortised into a door 2 in the usual way orsecured on the inner face. In the top, bottom and outer edge wall of thecasing, the three bolts 3, 4 5 are guided, the bolt 3 extending to theswinging edge, the bolt 4 to the top edge and the bolt 5 to the bottomedge of the door, the bolts being suitably guided on the door to slidelengthwise.

Each bolt is provided at its inner end with a notch or transverse groove6 for receiving a cam ridge 7 formed on a cam piece 8 located within thecasing 1 and provided with a hub 9 secured 011 a knob spindle 10 mountedto turn in the casing and extending transversely through the door andcasing and projecting from both faces of the door.

Tumblers 11 are pivoted at 12 to the inner surface of the cover plate 13and their free ends are provided each with a nose 14 which are presseddownward by a spring Specification of Letters Patent.

Application filed July 3, 1912.

Patented Feb. 17,1214.

Serial No. 707,411.

15 to engage said noses with a lug 16 on the cam piece 8 and lock thelatter in vertical position with the several bolts thrown out or shot. Aflat lever 17 is pivoted at 18 to the inner side of the cover plate 13and is provided at its lower. end with a handle knob 19 which passesthrough a curved slot 20 in the cover plate and at its upper end saidlever 17 has a lateral flange or band 21 which can act on the roundedshoulders 22 on the bottom edges of the tumblers 11 and rest against theadjacent straight shoulders 23 on the tumblers.

A key can be passed through the key hole 2-iin the casing and the prongson its bit can pass through the slots 25in a key guard plate 26 toprevent the use of improper keys the ends of the bit prongs act ing onthe upper edges of the tumblers to raise the ends having the noses 14.

The spring 27 acting on thelug 28 of the cam piece 8 tends to throw thesame into vertical position.

The operation is as follows: Fig. 2 shows all the bolts shot and thesame locked in place so that it' is impossible to open the door byturning the knob, the cam piece 8 being locked in place by the tumblers11. To unlock the door from the outside the proper key is insertedthrough the key hole 24 and turned to cause its bit to disengage thetumblers 11 from the lug 1.6 whereupon the cam piece 8 can be turned bymeans of the knob spindle 10 to withdraw the bolts as shown in Fig. 4.Before releasing the knob spindle and while the cam piece 8 is in theposition shown in Fig. 4 the lever 17 is shifted to rest against theshoulders 23 as shown in Fig. 4 in dotted lines and thereby hold thetumblers in raised position to prevent their engaging the lug 16 on thecam piece 8 when the latter after the releasing of the knob spindle isthrown by its spring 27 into the vertical position. The door can now beopened and closed by means of the knob spindle in the usual manner. Ifthe door is to be locked from the inside the lever 17 is shifted torelease the tumblers which then engage the lug 16 on the cam piece 8 assoon as the latter assumes the vertical position. To lock the door fromthe outside it is only necessary to turn the knob spindle from theinside, to withdraw the bolts, then open the door, adjust the lever 17so as to release the tumblers and then close the door from the outside,whereupon the tumblers will at once engage and lock the cam piece 8 andthereby the bolts.

In case the door is used very much as for example the main door of abusiness house and it is not desired that the knob should be turned eachtime the door is open, the cam piece 8 is to be lowered in the positionshown in Fig. i, and for this purpose a screw 29 is mounted in the rearplate, that is, the plate facing the inside of the room in such positionthat when the cam piece 8 is in the position shown in Fig. 4: a threadedhole 30 in the cam piece 8 will be in alinement with the screw 29 andthe inner end of this screw is engaged with said hole 30 and screwedinto the same thereby securely locking the cam piece 8 in the positionshown in Fig. t and thereby keeping all the bolts withdrawn. Beforeclosing the place at night the screw 29 is unscrewed from the threadedhole 30 to release the cam piece 8 so that it can operate in the mannerpreviously described.

Having described my invention what I claim asnew and desire to secure byLetters Patent is 1. The combination with a lock casing, of a series ofbolts guided to move in the direction of their length only and each boltcomposed of a single continuous piece, a rotative cam piece mounted toturn in said casing, and engaging the inner end of each bolt, tumblersin the casing for engaging and locking the cam piece, each tumbler beingprovided at one end with a nose for engaging the cam piece and providedin its bottom edge with a shoulder, a lever for shifting the tumblersand engaging their shoulders for holding the tumblers out of engagementwith the cam piece, substantially as set forth.

2. The combination with a lock casing of three bolts acting to move inthe direction of their length only and each composed of a singlecontinuous piece, a rotative cam piece mounted to turn in said casingand engaging the inner edge of each bolt, tumblers in the casing forengaging and locking the cam piece, each tumbler being provided at oneend with a nose for engaging the cam piece and provided in its bottomedge with a shoulder, a latch for shifting the tumblers and engagingtheir shoulders for holding the tumblers out of engagement with the campiece, a screw projecting through the inner side wall of the casing,into the casing, the tumbler being provided with a hole into which saidscrew can pass when the cam piece is so adjusted as to hold the boltswithdrawn.

, Signed at New York city, in the county of New York and State of NewYork, this 24th day of June, A. D. 1912.

'WILLIAM H. HOFFMANN.

Witnesses M. E. MoNrNoH, It. Gr. BREEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. 0.

